Kittens grow fast, and their nutrition needs to keep pace, so any supplement should support a complete diet rather than stand in for one. In our evaluation we looked at the ingredients and how appropriate they are for growing cats, the format and palatability for small mouths, and what each product is actually designed to do, from everyday multivitamins to calorie support for kittens who need help gaining. Taurine, an amino acid cats require, came up repeatedly and we noted where it appears. What we like are supplements that are clear about their purpose and easy to give a wiggly kitten. We favored named formats and sensible ingredient lists over vague promises. Below are our picks, the factors we weighed, and care notes. A complete kitten food usually provides what a healthy kitten needs, so we strongly recommend asking your veterinarian before adding any supplement, especially for a young or underweight kitten.
Best Kitten Vitamins (2026): 5 Top Picks Reviewed
We compared kitten vitamin and nutritional supplements on ingredients, format, and how they support growth alongside a complete diet. Our picks span multivitamin chews, liquids, and high-calorie support, and we stress checking with your veterinarian before supplementing a kitten.
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★ Top Pick: Cat Multivitamin Crunchy & Creamy Chews - Cat Treat…
Quick Comparison
| Product | Best For | |
|---|---|---|
| Cat Multivitamin Crunchy & Creamy Chews - Cat… | Best Overall | Check price → |
| Under the Weather Pet | Ready Cal for Kitten … | Best Value | Check price → |
| Cat Multivitamin,15 in 1 Cat Vitamins Liquid … | Best Premium | Check price → |
| Taurine for Cats Vitamins Treats, 15 in 1 Cat… | Runner-Up | Check price → |
| Greenies Feline Smartbites Kitten Treats, Chi… | Best Budget | Check price → |
Most healthy kittens on a complete diet get what they need from food. In our evaluation, the real value of these products is targeted support, for example calorie help for an underweight kitten, which is exactly when veterinary input matters most.
Types Explained
Multivitamin chews
Chewable or creamy supplements combining several vitamins to support overall condition.
Best for: Healthy kittens on a complete diet needing a general top-up.Liquid vitamin drops
Concentrated drops added to food for targeted vitamin and taurine support.
Best for: Owners who prefer a measured liquid dose mixed into meals.High-calorie support
Calorie-dense pastes or gels aimed at kittens who need help gaining or maintaining weight.
Best for: Underweight or recovering kittens, under veterinary guidance.Top 5 Picks
Cat Multivitamin Crunchy & Creamy Chews - Cat Treats for Health + Immune, Joint Support, Skin & Coat, & Digestion - Vitamins with Omega 3s, Lysine & Probiotics (30 Day Supply)
We chose the crunchy and creamy cat multivitamin chews because the broad multivitamin profile supports immune, joint, and general health in a format kittens tend to accept. We like that the two textures suit fussy eaters.
Under the Weather Pet | Ready Cal for Kitten | High Calorie Pet Nutritional Supplement for Weight Gain & Healthy Weight Maintenance | 10 Vitamins, 7 Minerals, Omega Fatty Acids & Carbohydrates | 80cc
We picked the 15-in-1 cat vitamin liquid drops for owners who want a measured, mixable dose covering heart and overall health. In our comparison the liquid format made portioning for a small kitten straightforward.
Cat Multivitamin,15 in 1 Cat Vitamins Liquid Drops Supplements for Heart Health, Bones, Joint, Skin & Coat, Bladder, Immune System Support 60ml
We rated Under the Weather Ready Cal for Kitten highest for targeted support because the high-calorie formula helps kittens who need help gaining weight. We like that it addresses a specific need rather than general topping-up, and it suits use under veterinary guidance.
Taurine for Cats Vitamins Treats, 15 in 1 Cat Multivitamin Support Joint, Skin Coat, Digestion, Immunity & Energy, 500 Crunchy & Creamy Chews with Essential Vitamin for Cats All Ages (90-Day Supply)
We like the taurine-focused 15-in-1 multivitamin treats because taurine is an amino acid cats genuinely require, and the chews support joint and skin health too. It landed just behind because it overlaps with our top multivitamin pick.
Greenies Feline Smartbites Kitten Treats, Chicken Flavor, 2.1 oz. Pouch
We chose the Greenies Feline Smartbites Kitten Treats, Chicken Flavor, 2.1 oz. Pouchtreats as the budget pick because they offer a kitten-formulated bite at an accessible price. They suit owners wanting a simple kitten treat rather than a full multivitamin program.
Key Buying Factors
Purpose of the supplement
Some products are daily multivitamins, others are calorie support for underweight kittens. We matched each to its intended use so you choose the right tool.
Ingredient appropriateness
We read the panels for kitten-relevant nutrients like taurine and balanced vitamins. A supplement should complement a complete diet, not duplicate or overload it.
Format and palatability
Chews, liquids, and pastes differ in how easily a kitten accepts them. We favored formats that a small, fussy kitten will take willingly.
Growth support
Kittens have high energy and nutrient needs. We assessed how each product supports development without exceeding sensible amounts.
Clear dosing for small animals
Kittens are tiny, so dosing accuracy matters. We valued clear instructions scaled for kitten size to avoid over-supplementation.
Veterinary guidance
Because this is a health category, we weighted the importance of vet input. The right supplement depends on your kitten's diet and condition.
Care, Cost and Maintenance
Check with your veterinarian first
A complete kitten food usually covers a healthy kitten's needs, and over-supplementing can do harm. Ask your veterinarian whether your kitten needs a supplement and at what dose.
Support, do not replace, the diet
Vitamins and calorie support work alongside proper kitten food, never instead of it. Make sure the core diet is complete and balanced first.
Introduce slowly and watch
Offer a small amount at first and watch for any digestive upset or refusal. A gradual introduction helps a fussy kitten accept it and lets you catch problems early.
Match the format to your kitten's temperament. A creamy chew or a flavored liquid mixed into wet food is far easier to give a squirming kitten than a firm treat, and consistency is what makes a supplement worthwhile.